Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-01-11
2005-01-11
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140AG, C330S110000, C330S308000, C315S151000
Reexamination Certificate
active
06841771
ABSTRACT:
A light-receiving circuit of an optical coupling device may include a dummy photodiode arranged in a vicinity of a photodiode. The dummy photodiode and photodiode may convert received optical signals to photoelectric current. Amplified photoelectric current outputs from current-to-voltage converting amplifiers may be compared and subjected to waveform shaping by a hysterisis comparator for improving a common mode rejection ratio. Negative feedback paths and/or circuits of the converting amplifiers may include impedance variable circuits. The impedance variable circuits may reduce impedance based on the level of the input photoelectric current.
REFERENCES:
patent: 3978343 (1976-08-01), Broderick et al.
patent: 5812030 (1998-09-01), Inami et al.
patent: 5828178 (1998-10-01), York et al.
patent: 5952883 (1999-09-01), Masuta
patent: 6201235 (2001-03-01), Takeuchi et al.
patent: 6246284 (2001-06-01), Nemoto
patent: 7-105524 (1995-11-01), None
patent: 2531070 (1996-06-01), None
patent: 2689967 (1997-08-01), None
patent: 2770810 (1998-04-01), None
Allen Stephone B.
Harness Dickey
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